A Study of Strength Parameter Evolution and a Statistical Damage Constitutive Model of Cemented Sand and Gravel
Cemented sand and gravel (CSG) has a wide range of applications in dam construction, and its properties are between rockfill and roller compacted concrete (RCC). A difference in gel content will result in a variance in CSG’s structure and mechanical properties. To investigate the intricate structura...
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| Format: | Article |
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MDPI AG
2023-01-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/2/542 |
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| author | Honglei Ren Xin Cai Yingli Wu Peiran Jing Wanli Guo |
| author_facet | Honglei Ren Xin Cai Yingli Wu Peiran Jing Wanli Guo |
| author_sort | Honglei Ren |
| collection | DOAJ |
| description | Cemented sand and gravel (CSG) has a wide range of applications in dam construction, and its properties are between rockfill and roller compacted concrete (RCC). A difference in gel content will result in a variance in CSG’s structure and mechanical properties. To investigate the intricate structural mechanical properties of CSG, this study conducted a series of laboratory tests and associated discrete element analyses. Accordingly, the evolution law of the strength parameters of CSG is explored and a statistical damage constitutive model suitable for CSG is established. The main contributions of this study are as follows: (1) The failure mechanism of the CSG was described from the microscopic level, and the evolution law of the strength parameter cohesion and friction angle of the CSG was analyzed and summarized. (2) Based on the particle flow model, the energy development law and the spatiotemporal distribution law of acoustic emission (AE) provide illustrations of the strain hardening–softening transition features and the interaction between cohesion and friction of CSG. (3) The evolution function between the strength parameter and the strain softening parameter was built, and the critical strain softening parameter was determined by the microcrack evolution law of the particle flow model. (4) The accuracy of the evolution curve was confirmed by comparing it to experimental results. (5) Based on the relationship between cohesion loss and material damage, a statistical damage constitutive model was developed using the improved Mohr–Coulomb strength criterion as the micro strength function. The constitutive model can accurately describe the stress–strain curves of CSG with different gel content. Furthermore, the model reflects the strain hardening–softening properties of CSG and reveals the relationship between the weakening of cohesion and material damage at the microscopic level. These findings provide valuable guidelines for investigating the damage laws and microcosmic failure features of CSG and other relevant materials. |
| first_indexed | 2024-03-09T11:51:39Z |
| format | Article |
| id | doaj.art-8dc2358691494873a0cec31889bed49c |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T11:51:39Z |
| publishDate | 2023-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-8dc2358691494873a0cec31889bed49c2023-11-30T23:14:43ZengMDPI AGMaterials1996-19442023-01-0116254210.3390/ma16020542A Study of Strength Parameter Evolution and a Statistical Damage Constitutive Model of Cemented Sand and GravelHonglei Ren0Xin Cai1Yingli Wu2Peiran Jing3Wanli Guo4Materials & Structure Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210029, ChinaMaterials & Structure Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210029, ChinaGeotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210029, ChinaState Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, ChinaGeotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing 210029, ChinaCemented sand and gravel (CSG) has a wide range of applications in dam construction, and its properties are between rockfill and roller compacted concrete (RCC). A difference in gel content will result in a variance in CSG’s structure and mechanical properties. To investigate the intricate structural mechanical properties of CSG, this study conducted a series of laboratory tests and associated discrete element analyses. Accordingly, the evolution law of the strength parameters of CSG is explored and a statistical damage constitutive model suitable for CSG is established. The main contributions of this study are as follows: (1) The failure mechanism of the CSG was described from the microscopic level, and the evolution law of the strength parameter cohesion and friction angle of the CSG was analyzed and summarized. (2) Based on the particle flow model, the energy development law and the spatiotemporal distribution law of acoustic emission (AE) provide illustrations of the strain hardening–softening transition features and the interaction between cohesion and friction of CSG. (3) The evolution function between the strength parameter and the strain softening parameter was built, and the critical strain softening parameter was determined by the microcrack evolution law of the particle flow model. (4) The accuracy of the evolution curve was confirmed by comparing it to experimental results. (5) Based on the relationship between cohesion loss and material damage, a statistical damage constitutive model was developed using the improved Mohr–Coulomb strength criterion as the micro strength function. The constitutive model can accurately describe the stress–strain curves of CSG with different gel content. Furthermore, the model reflects the strain hardening–softening properties of CSG and reveals the relationship between the weakening of cohesion and material damage at the microscopic level. These findings provide valuable guidelines for investigating the damage laws and microcosmic failure features of CSG and other relevant materials.https://www.mdpi.com/1996-1944/16/2/542cemented sand and gravel (CSG)Mohr–Coulomb strength criterionstrength parameterparticle flowacoustic emissionstatistical damage |
| spellingShingle | Honglei Ren Xin Cai Yingli Wu Peiran Jing Wanli Guo A Study of Strength Parameter Evolution and a Statistical Damage Constitutive Model of Cemented Sand and Gravel Materials cemented sand and gravel (CSG) Mohr–Coulomb strength criterion strength parameter particle flow acoustic emission statistical damage |
| title | A Study of Strength Parameter Evolution and a Statistical Damage Constitutive Model of Cemented Sand and Gravel |
| title_full | A Study of Strength Parameter Evolution and a Statistical Damage Constitutive Model of Cemented Sand and Gravel |
| title_fullStr | A Study of Strength Parameter Evolution and a Statistical Damage Constitutive Model of Cemented Sand and Gravel |
| title_full_unstemmed | A Study of Strength Parameter Evolution and a Statistical Damage Constitutive Model of Cemented Sand and Gravel |
| title_short | A Study of Strength Parameter Evolution and a Statistical Damage Constitutive Model of Cemented Sand and Gravel |
| title_sort | study of strength parameter evolution and a statistical damage constitutive model of cemented sand and gravel |
| topic | cemented sand and gravel (CSG) Mohr–Coulomb strength criterion strength parameter particle flow acoustic emission statistical damage |
| url | https://www.mdpi.com/1996-1944/16/2/542 |
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